Incandescent-lamp-bulb socket.



C. A. NELSON.

KNCANDESCENT LAMP BULB 300K APPLXCATION HLED MAY 22. raw.

1362 2870 menwi A31", 9,1918.

Y GEAR-LES CI-EI'-"AGO. KLLIETQIS, A

INE'LSGE, 025 GHZCAGO, ILLINOIS, ASSIGNGE "330 C. NELSON 139., C1. EEOBATIDIE 933 EL MIND? INCAIXDESCEHT-LAEi' -BULB SOCKET.

Application filed May 22, 1916.

r aZZ whom t may concern:

Be it'known that I, Ci-Innrins A. lilnnson, a citizen of the United States, residing at Chicago, in the county of Cool; and State or lllinois, have invented certain new and useful Improvements in lncandescentdlamp- Bulb Sockets, or which the following is a specification.

This invention relates to inniroveinents in incandescent lamp bulb sockets, and it has for its salient object to provide a simplified construction in which the use of blocks or masses of porcelain, hard rubber, etc, is eliminated and all, or substantially all, of the interfitting parts made of sheet material capable oi being pressed or stamped into the desired form; to provide a construction in which a maximum amount of space is provided in the interior chamber in which the attachment of the leading-in wires to the terminals is effected, to the end that such attachment and detachment may be more conveniently accomplished and with less danger of short eircuiting; to provide a construction which is extremely economical both of manufacture of the parts and assemblenient thereof; to provide a construction which because of its simplicity and manner of construction is extremely durable and free from liability of getting out of order; and in general, to provide improved device of the character referred to.

The invention will be readily understood from the following description, reference being had to the accompanying drawing, in Wl1lCl1- Figure l is an axial sectional improved socket;

2 is cross-sectional VlQW taken in the plane of the line Describing the preferred embodiment of my invention, and referring to the drawing, 1 designates an outer generally cylindric shell, the respective end portions of which dilier somewhat in diameter; the two pertions of dillerent diameter being joined by an inclined shoulder 2 which serves as a, stop or seat for internal parts, as hereinafter described. The shell is provided with a lining 3 of insulating sheet material, as for example "red fiber, and which conforms to the interior of tie shell. The larger end of the body shell is closed by a slip-cover or cap l, aroundthe center 0t which is formed a neck-like extension 5 in which is seated the view Or the specification of Letters Patent.

serial H0. 99,28?

insulating thiinble 6. The cap is also provided with a lining of sheet insulating material T conformed thereto.

Describing now internal mechanism, 8 and 9 designate respectively two cupshaped sheet metal members which are arranged base to base in. axial alinement with each other," insulated from eachother, and secured together by a series of rivets 10, 11 and 12. The larger cup member 8 constltutes the supporting member which carries the rest of the internal mechanism, and it has its lower or closed end seated against the inclined shoulder 52 hereinbeforo mentioned. It is preferably somewhat smaller in external diameter than the interi r of the insulating lining 3 and is centered or 1nterspaced within said insulating lining by means of a series of external longitudfinallyv extending ribs {see Fig. 2).

At diametrically opposite points, wall portions of said cup member 8 are struck in by means of to form embracing clips 13 integral with the main body of the cup. These clips embrace and hold the respective terminal strips 14-, la; the terminal strips being insulated from the clips by interposed sheet insulation 16. Preferably. and as shown herein, the cup member 8 is lined with sheet insulating material 17 formed into cup-shape and fitting accurately the interior of the member 8 the insulation interposed between the terminal strips and the clips 13 being formed of flaps struck out from the inner insulating shell 17 in a manner similar to the formation of the clips 13 as parts of the cup member 8.

Each of the terminal. strips has an inturned outer end portion in which the corresponding binding screw is inserted whereby the leading-in wires 18 and 19 are connected. Terminal strip has a tongue i l struck out of its interior portion and extending at right angles across axis of the socket member, while terminal strip has its lower end bent at right angles inwardly to overlie the insnlation on the of the cup-member 8 and has direct n etallic connection with the rivet 11. separate metal plate 20 is mounted upon and insulated from the bottom of the cap member 8 and has direct metallic contact with the rivet 10 which extends through said plate and through a L -shapeol contact member 21 arranged with in the smaller cup member [a contact spring 22 is mounted upon plate 20, and this contact spring and the opposed tongue 14 cotiperate with a metal bridging switch button 28 which is mounted upon the end of a thumb shaft 24 extending out through the -side of the socket and provided with the usual thumb nut.

The smaller cup member 9 constitutes the socket proper in which the shank of the lamp bulb is inserted, being to this end pressed into screw threaded form, as usual.

The circuit through the socket member and bulb is as follows: from leading-in wire 19 to terminal strip 14, through tongue 14;, to switch button 23, thence to contact strip 22, plate 20, rivet 10, spring contact 21 to the central or internal contact of the lamp bulb, through the filament to the shell of the lamp shank which screws into direct metallic contact with the cup 9. The return circuit is from cup 9, through rivet ll, terminal strip 15 and leading-in wire 18.

Turning the switch button ninety degrees opens the circuit between the tongue 14 and contact strip 22.

It will be understood from the foregoing description that my improved device may be most economically and conveniently constructed and assembled. The outer shell and slip cover or cup thereof may be separately fitted with said respective linings. The cup member 8 may be provided with its insulating lining and the terminal strips properly mounted and secured in place therein. The two cups may then be placed base to base and the insulation and rivets inserted,'and the two parts permanently ,joined, after which the internal unit so formed ma be inserted in place within the shell an all secured rigidly in place by the simple placing of the cap 4 upon the outer shell. Ob-' viously the internal mechanism unit may be withdrawn from the shell with equal ease, for the purposes of inspection, repair or for more conveniently attaching the leading-in wires to the terminals.

It will be obvious that the details of construction and arrangement may be modified without departing substantial from-the invention as herein shown an described. The appended claims, therefore, are to be construed in a manner commensurate with their terms and the state of the prior art.

I claim as my invention:

1. In an incandescent lamp socket, an outer shell, a pair of cup-shaped members secured together at theirbases, contact holding clips formed from one of said cupshaped members, and the other of said cupshaped members formed to constitute the lamp holding shell.

In an incandescent lamp socket, an outer shell formed of sheet metal, a pair of sheet metal cup-shaped members connected.

base to base and insulated from said outer shell, and a cap for said outer shell for securing the parts together.

3. In an incandescent lamp socket formed of sheet metal stampings, an outer supporting shell, an inner cup-like shellseated Within and insulated from said outer shell, contact-holding clips formed from said inner shell and lying within the latter, contactstrips held by said clips, a lamp-receiving shell, a spring-contact supported therein, rivets connecting the bases of the lamp shell and the inner shell, and a contact device mounted on the base of the inner shell and electrically connected with the contact of the lamp-receiving shell.

4. In an incandescent lamp socket, an outer shell formed of sheet metal and having a shoulder intermediate its ends, an inner shell insulated from said outer shell and adapted to be supported by the shoulder on said outer shell, contact-holding clips formed from said inner shell, contact strips secured in said clips, said strips having their upperends bent to form bindin posts, a. lamp-receiving shell insulated rom said outer shell, a pluralit of rivets for securin said lamp-receiving s ell to said inner shel one of said rivets being the electrical connection between one of said strips and said lamp-receiving shell, and a cap for the upper end of said outer shell forsecuring-the parts together. I

EMILIE Rosa, A. H. GRAvEs. 

